displayEmail cannot be null

[Malik056]

Getting error displayEmail cannot be null, just copy pasted from Pub.dev
Help please,
Thanks,

var initializer = RavePayInitializer(
        displayEmail: true,
        displayAmount: true,
        displayFee: true,
        amount: amount,
        publicKey: 'FLWPUBK-XXxxxxxxxxxXXxxxxxx-X',
        encryptionKey: 'eded53xxxxxxxxxxxxxxx7d')
      ..country = "ZA"
      ..currency = "ZAR"
      ..email = "${user.email}"
      ..fName = "${user.firstName}"
      ..lName = "${user.lastName}"
      ..narration = ''
      ..txRef = user.userId + time.millisecondsSinceEpoch.toString()
      ..acceptAccountPayments = true
      ..acceptCardPayments = true
      ..acceptAchPayments = true
      ..acceptGHMobileMoneyPayments = true
      ..acceptUgMobileMoneyPayments = true
      ..staging = true
      ..isPreAuth = true
      ..displayFee = true;

    // Initialize and get the transaction result
    RaveResult response = await RavePayManager()
        .initialize(context: context, initializer: initializer);

[Malik056]

rebuilding solved it.